Pneumatically Operated Remote Control Valve For Freshwater and Seawater Service Series 403, Globe Pattern, Single seat with resilient disc insures tight seal, Simply designed with few working parts, Quick response to remote control, Fully supported frictionless diaphragm, Leak-proof service assured -no packing glands, Single tube line required for control, Opens wide for minimum flow resistance. This valve is used where "on-off" control is required. Pressure signals from a remote control "open or close: a small auxiliary valve installed on the main valve cover, which in turn opens or closes the main valve. Only the small amount of fluid in the auxiliary valve cover must pass through the remote control pilot in order to fully open or close the larger main valve. The valve consists of a 100-01 Hytrol main valve and a small Hytrol auxiliary valve. Both the main and the auxiliary valves are single-seated, diaphragm operated globe type valves. Line pressure applied to the auxiliary valve cover closes the main valve drip tight. STANDARD MATERIALS: Body & cover: Ductile iron ASTM A-536 internally & externally epoxy coated, Trim: Bronze ASTM B61, Pilot control valve: Cast Bronze ASTM B61 with monel trim and SS-316 tubing & fittings END DETAILS: 125 and 250 ANSI B16.1, PRESSURE RATINGS: 125 class 175 psi max. OR 250 class 300 psi max., TEMPERATURE RANGE: Water to 180 deg F max.